Hughes G E <br/><br/>
Introduction to modal logic 

 - London  Methuen         1968 
<br/><br/><label>Standard No.: </label>65,123 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PHILOSOPHY
<br/><br/><label>Dewey Class. No.: </label>R14, K83-;1